Security readout for executives and security teams
Plain-English summary
This flaw affects Atlassian’s Auto-Unapprove Plugin for Bitbucket Server, not Bitbucket Server by default. If installed, a timing weakness in asynchronous backend events could let an attacker bypass review safeguards and merge code into repositories without expected approval controls.
Executive priority
Treat this as high priority where the plugin protects sensitive repositories. The business risk is unauthorized code entering source control, which can affect product integrity, deployment pipelines, and downstream customers.
Technical view
CVE-2017-16857 is a bypass in the Auto-Unapprove Plugin caused by reliance on asynchronous backend events. Sources state all plugin versions before 3.0.1 are affected. No CVSS, CWE, or detailed exploit prerequisites are provided in the bundle.
Likely exposure
Exposure is limited to Bitbucket Server environments that installed the separate Auto-Unapprove Plugin before version 3.0.1. The plugin is not bundled with Bitbucket Server, so Bitbucket version alone does not establish exposure.
Exploitation context
The source describes bypass via minimal brute force and potential unauthorized code merge. There is no KEV listing and no cited evidence of active exploitation in the provided bundle.
Researcher notes
Evidence is narrow but clear: affected product, pre-3.0.1 scope, and bypass impact are stated. Missing details include CVSS, CWE, authentication requirements, and vendor-described mitigations beyond the fixed version.
Mitigation direction
- Inventory Bitbucket Server plugin installations for Auto-Unapprove Plugin use.
- Upgrade the Auto-Unapprove Plugin to version 3.0.1 or later.
- Confirm repository merge controls do not rely solely on the vulnerable plugin behavior.
- Check Atlassian advisory guidance before applying compensating controls.
- Prioritize repositories containing production, deployment, or privileged automation code.
Validation and detection
- Verify whether the Auto-Unapprove Plugin is installed on Bitbucket Server.
- Record the installed plugin version and compare it with 3.0.1.
- Review recent repository merges for unexpected approval bypasses.
- Confirm Bitbucket Server itself is not treated as affected without the plugin.
- Document exposed repositories and owners for remediation tracking.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2017-16857 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://jira.atlassian.com/browse/BSERV-10439CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.